Keyboard



FIG. 1 is a front perspective view of a keyboard according to our design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a rear perspective view thereof.

Any broken lines shown in the drawings are for illustrative purposes only and do not form a part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 